Structural settings and geochemistry of the Myschka gold prospect, Tintina Gold Belt, Mt. Selous area (105K/16, 105N/1), Yukon

Serguei G. Soloviev, Carl M. Schulze and Oleksiy E. Baklyukov Klad Enterprises Ltd.1

Soloviev, S.G., Schulze, C.M. and Baklyukov, O.E., 2003. Structural settings and geochemistry of the Myschka gold prospect, Tintina Gold Belt, Mt. Selous area (105K/16, 105N/1), Yukon. In: Yukon Exploration and Geology 2002, D.S. Emond and L.L. Lewis (eds.), Exploration and Geological Services Division, Yukon Region, Indian and Northern Affairs Canada, p. 295-306.

ABSTRACT The Myschka property overlies a large mineralized area within and adjacent to a 1200 m by 600 m Cretaceous Tombstone Suite granodioritic intrusion. Mineralization is controlled by at least four wide east-west-trending lensoid zones of faulting, brecciation and hydrothermal alteration. Just north of the intrusion, the zones were followed for a distance of 1500 m; widths of individual zones vary from 20 to 100 m. The zones tend to coalesce into much wider (up to 200 m) brecciated packages that dip steeply (70-85°) to the south and apparently crosscut the intrusive. A network of northerly dipping fault and alteration zones crosscut these breccias. The breccias include intensive quartz stockwork and thicker quartz-fi lled shear zones containing disseminated gold-bearing sulphide (pyrite, arsenopyrite) mineralization. Rock samples returned numerous strongly anomalous gold values ranging from 200 ppb to 1.05 g/t throughout the extent of the breccia zones. Larger quartz veins locally exhibit much stronger sulphide enrichment, resulting in higher Ag, Bi, Sb, Pb, Zn and Cu values infl uencing property-scale geochemical zonation. A distinctive gold and pathfi nder element soil anomaly is coincident with the breccia packages. During the 2002 exploration program, the prospect was advanced to drill-ready stage. Proposed drilling will test subsurface continuation of gold-bearing fault/breccia and alteration zones into the intrusive rock.

RÉSUMÉ La propriété Myschka repose sur une vaste zone minéralisée qui se trouve à l’intérieur et près d’une intrusion granodioritique de la Suite de Tombstone du Crétacé (1200 m sur 600 m). La minéralisation est contrôlée par au moins quatre grandes zones lenticulaires à direction est qui sont faillées, bréchifi ées et altérées par des fl uides hydrothermaux. Juste au nord de l’instrusion, on a suivi les zones sur une distance de 1500 m; les largeurs individuelles varient de 20 à 100 m. Elles ont tendance à fusionner pour former de vastes brèches (jusqu’à 200 m de large) qui pendent fortement (70-85°) vers le sud et recoupent apparemment l’intrusion. Un réseau de zones faillées et altérées inclinées vers le nord recoupent ces brèches. Les brèches incluent un stockwork de quartz et des zones de cisaillement plus épaisses remplies de quartz recelant des sulfures aurifères disséminés (pyrite, arsénopyrite). Les échantillons de roche prélevées sur toute l’étendue des zones bréchifi ées ont donné de fortes anomalies d’or variant de 200 ppb à 1,05 g/t. Les plus gros fi lons de quartz affi chent localement un enrichissement plus marqué en sulfures, d’où des teneurs plus élevées en Ag, Bi, Sb, Pb, Zn et Cu qui infl uent sur la zonation géochimique à l’échelle de la propriété. Une anomalie caractéristique d’or et des éléments indicateurs dans le sol coïncide nettement avec les ensembles de brèches. Au cours de la campagne d’exploration de 2002, on a poursuivi les travaux de préparation jusqu’à l’étape des forages. Ceux-ci permettront de vérifi er la continuation souterraine des zones faillées/bréchifi ées et altérées aurifères dans la roche intrusive.

1104-135 10th Ave S., Cranbrook, British Columbia, Canada V1C 2N1, tel: 250-489-5156, fax: 250-489-5185, [email protected]

YUKON EXPLORATION AND GEOLOGY 2002 295 PROPERTY DESCRIPTION

INTRODUCTION sulphide-related (pyrite, arsenopyrite) gold mineralization, and bismuth-copper (chalcopyrite), arsenic (arsenopyrite) The Myschka property, 100% owned by Klad Enterprises and antimony (stibnite) veins. This is very similar to the set Ltd., is situated 110 km north of the town of Ross River, of intrusive-related mineral deposits and occurrences Yukon, within the Tintina Gold Belt (Fig. 1). The property known within some other large mineralized districts of is located 60 km west of the North Canol Road, which the Tintina Gold Belt. The broad occurrence of lead-zinc- extends northeast from Ross River to the Yukon- silver and gold shows the Mt. Selous cluster to be most Northwest Territories border near the Mactung tungsten similar to mineralization in the Mayo and Keno Hill areas, deposit. The property is centred at 62°59' north latitude, although some local variations (in particular, greater 132°07' west longitude on NTS map sheets 105K/16 and abundance of sphalerite in the base metal veins) are well 105N/1, and consists of 106 contiguous Yukon quartz pronounced. A base metal (+As, Sb) signature is usually mining claims covering 2216 hectares (5475 acres). Two considered to refl ect a distal position of gold airstrips of unknown condition exist roughly 9 km to the mineralization relative to a parental pluton (Mortensen southeast and 5 km to the southwest of the central et al., 1996), although some variations in metallogenic property area. specialization of the intrusives (and related mineralized The Myschka property is part of a large cluster of base districts) can also be considered. metal, silver and gold occurrences found within or close to the eastern contact of the Mt. Selous Batholith belonging to the 92 Ma mid-Cretaceous Tombstone EXPLORATION HISTORY Intrusive Suite, the major magmatic and metallogenic unit In 1967, the Lad claims were staked roughly 5 km west- of the Tintina Gold Belt (British Columbia and Yukon southwest of the present Myschka property centre by the Chamber of Mines, 2000). The mineralized cluster in its Hess Project (Atlas EL, Quebec Cartier Mining Company currently known extent, occupies an area exceeding 20 and Phillips Brothers (Canada) Ltd.). Work consisted of by 20 km, and incorporates several small granitoid stocks geological and geochemical surveying, and hand apparently satellitic to the Mt. Selous Batholith. The set of trenching, followed in 1969 by road construction and mineral occurrences includes high-grade lead-zinc-silver bulldozer trenching. The program revealed a Pb-Zn-Ag (galena, sphalerite) veins, chalcopyrite-pyrrhotite occurrence exposed for 15 m, with values averaging (+ scheelite?) skarns, stockwork and disseminated 205.7 g/t Ag, 6% Pb, 3% Zn and 2% Cu across widths of

NWT Beaufort Plata Yukon Sea showing N

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296 YUKON EXPLORATION AND GEOLOGY 2002 SOLOVIEV ET AL. – MYSCHKA GOLD PROPERTY, MT. SELOUS AREA

0.3 to 3.0 m. In 1974, the Atlas interest was transferred to Dasha 1-6 claims, obtaining a 100% interest in the entire Cima Resources Ltd., which, in 1977, drilled two holes package. totaling 252 m. The drilling intersected two parallel veins within a fault zone; the upper vein returned 133.7 g/t Ag, 5.3% Pb and 4.7% Zn across 1.2 m, and the lower one REGIONAL GEOLOGY returned values up to 48.0 g/t Ag, 0.4% Pb and 1.6% Zn The Myschka property is located within the Tintina Gold across 2.1 m (Yukon MINFILE, 2001). Belt (British Columbia and Yukon Chamber of Mines, The current north-central portion of the Myschka 2000), which follows a trend of mid- to Late Cretaceous property was originally staked in 1968 as the Solo claims granitoid (diorite, granodiorite, quartz monzonite, syenite) by the Hudson Bay Mining and Smelting Company, which intrusions that extend from central Alaska, across central conducted grid soil sampling and geological mapping in Yukon, to the Yukon-British Columbia border. This belt is 1968 and 1969. In 1990, Noranda Exploration Company roughly parallel to the ancient North America craton Ltd. staked the Rush claims covering portions of the boundary. In Yukon, the belt is superimposed on the southern Myschka claims. Selected samples returned Selwyn Basin, a thick sequence of shelf and off-shelf values up to 3017 g/t Ag, 75% Pb and 0.2% Zn; a continental margin sedimentary rocks formed from late separate sample returned 665 g/t Ag (Yukon MINFILE, Precambrian to Triassic time (Gordey and Anderson, 2001). 1993). In 1996-1997, Mr. Ron Berdahl, a Yukon prospector, The southeastern portion of the Selwyn Basin, including staked the Andrew claims centred about 6 km southwest the Myschka property, is underlain by a broad package of of the present Myschka property centre to cover an old Ordovician to Devonian Road River Group and Devono- occurrence described as Ag-Pb-Zn-Cu veins. A Mississippian Earn Group sedimentary rocks, with upper composite grab sample of oxidized surface material Precambrian to Lower Cambrian Hyland Group returned a value of 17% Zn (Burke, 2000). Subsequently, sedimentary units extending northwest of the property. the claims were optioned to Noranda Exploration Hyland Group sedimentary rocks consist largely of coarse Company Ltd., which added the AMB 1-111 claims, and clastic ‘grits’, shales and lesser limestone and calcareous followed up in 2001-2002 with surface exploration and a clastic rocks. Road River Group rocks consist mostly of diamond-drilling program. This work investigated the thick chert horizons with lesser interbedded shale, potential of this mineralization, considered to be of a limestone and calcareous mudstone, with minor mafi c sedimentary-exhalative (SEDEX) style. The work, however, volcanic units. Earn Group rocks consist of chert-pebble proved that the mineralization is of hydrothermal origin conglomerate and greywacke, as well as lesser shale and (M. Burke, pers. comm., 2002). sandstone. The area has been mapped by the Geological Survey of The Mt. Selous Batholith, roughly 20 by 12 km, represents Canada and has been covered by the National the largest Tombstone Suite pluton in the property area. Geochemical Reconaissance stream-sediment sampling The batholith is generally oval-shaped and elongated program (Friske et al., 1990), which has identifi ed the roughly southeast-northwest; the shape of its eastern property area as having highly anomalous arsenic, contact suggests it extends eastwards beneath the antimony and gold values. In 1998, Viceroy International Paleozoic sedimentary rock, which has been intruded by Exploration Ltd., in the course of a regional gold several much smaller satellitic stocks. Notably, the reconnaissance program, conducted limited surface majority of known mineral occurrences in the area are geochemical sampling and geological mapping in the area found to the east of the batholith exposure. The intrusive and staked the Myschka 1-16 claims. Viceroy also staked rocks are largely medium- to coarse-grained weakly the Tarakan claims, 15 km northwest, and the Uragan porphyritic hornblende-biotite to biotite-hornblende claims, 6 km northeast, to cover gold occurrences. In quartz diorite to quartz monzonite. Late felsic dykes 1999 Viceroy transferred its 100% interest in the claims to (quartz-feldspar porphyritic granites) occur locally. Novagold Resources Inc. which allowed the Myschka The area is transected by a number of northwest-striking claims to lapse. In 2001, the central portion of the faults and fault zones, the largest of which is attributed to Myschka property was staked as the Sophia claims by an eastern extension of the Jurassic–Early Cretaceous Ron Berdahl. In 2002, Klad Enterprises Ltd. optioned these Robert Service Thrust. This major regional-scale south- claims and staked the adjoining Myschka 1-96 and

YUKON EXPLORATION AND GEOLOGY 2002 297 PROPERTY DESCRIPTION

dipping thrust fault extends across the southern property occurs proximal to the central stock, particularly along the boundary, emplacing Hyland Group sedimentary rocks southeastern contact. Bedding of the sedimentary rocks over the Road River and Earn Group packages, and extends roughly east-southeast, dipping steeply to the forming an east-trending thrust fault (GSC Open File south-southwest. To the west, a northwest-trending fault 2174). Distinctive fault zones found within the mid- to separates the Road River Group rocks from the Earn Late Cretaceous Tombstone Suite intrusive rocks suggest, Group chert-pebble conglomerate to the west. To the however, that faulting could also be syn-plutonic (and south of the map area, the Robert Service Thrust fault control the mineralization). Faulting could even postdate extension separates these rocks from the Hyland Group, the Late Cretaceous, and possibly be synchronous with which consists primarily of coarse clastic ‘grits’ and shale, the initialization of motion along the Tintina Fault but includes a kilometre-wide southeast-trending (Flanigan et al., 2000b). crystalline limestone unit. The area adjacent and immediately north of the central PROPERTY GEOLOGY stock contains a suite of east-west-trending lenticular mineralized zones of fracturing, brecciation and The property is centred on a 1200 m by 600 m west- hydrothermal alteration. To date, four major zones have southwest-elongated Tombstone Suite quartz diorite been identifi ed: from north to south these are the intrusion situated 10 km east of the Mt. Selous Batholith Rainbow Zone; the Second Zone, which bifurcates into (Fig. 2). This apparently satellitic stock intrudes the Road the Second A and Second B Zones; the Upper Zone just River Group sequence of thin- to medium-bedded chert north of the intrusive; and the Back Zone along the and lesser shale. A smaller quartz diorite stock occurs southern intrusive contact. The zones have been some 500 m southeast of the central stock. A swarm of delineated for strike lengths to 1500 m, with widths east-southeast-trending quartz-feldspar porphyritic dykes ranging from 20 to 100 m; they have a tendency to

Cretaceous B 643000 644000 6988000 645000 Tombstone Plutonic Suite Kqm quartz monzonite, quartz diorite OSDr N OSDr Devonian-Mississippian Earn Group ZZoneone DMe RRainbowainbow chert-pebble conglomerate, shale 345 Ordovician-Devonian 230 Road River Group SSecond OSDr chert, shale econd 35 100 A 550 260 ZZoneonnee 135 Veining and alteration zones 445555 130 360 e 449 a b SSecondecoonndd B ZZoneon 185 quartz veining and stockwork zones: 330505 125 a) identified 332 6987000 b) interpreted 120120 UUpper 15 pper a b 110 ZZoneone sectors of intensive alteration and quartz veining Kqm a) sectors of most 663535 central intensive alteration stock 385 b) intensive quartz veining 150 BBackac k 332020 ZZoneone geological contact 1050 Kqm dykes fault (determined or interpreted) DMe A zone boundary 6986000 rock sample location, gold in ppb silt sample location, gold in ppb property boundary, present NTS sheet 105K/16 0 500 1000 OSDr m Figure 2. Compilation map of Myschka area.

298 YUKON EXPLORATION AND GEOLOGY 2002 SOLOVIEV ET AL. – MYSCHKA GOLD PROPERTY, MT. SELOUS AREA

Figure 3. Hypothetical A B section: line A-B (see Back Upper Zone Figure 2), Myschka Zone Second Zone property, looking west. 1500 m Rainbow Zone

KKqmqm

1000 m

KKqmqm

quartz-diorite intrusive (Kqm) 500 m quartz veining and stockwork zones 0 200 400 600 metres a b area of intensive quartz veining fault a) sectors of most intensive 0 1000 2000 feet geological contact alteration b) intensive quartz veining

coalesce into much wider brecciated packages up to higher metal values in brecciated sedimentary rocks 200 m wide. These breccia zones dip steeply (70-85°) proximal to the stock, is also coincident with a large and southwards, with local north-dipping sections; they are well pronounced Au, Bi, Pb, Ag, Sb and much wider As interpreted to crosscut the intrusive rocks at shallow soil anomaly overlying the essentially overburden-covered depths (Fig. 3). These zones contain intensive auriferous stock. quartz stockwork and larger quartz-fi lled shear-like fractures, as well as intervals of ‘bulk’ mineralization. Probably, these and other similarly oriented zones also ALTERATION AND MINERALIZATION control some of the lead-zinc-silver veins. A broad system of argillic (clay) alteration, silicifi cation Although narrow and less expressed in the form of and locally intensive phyllic (sericite) alteration occurs brecciation, the west-northwest and north-northeast- within the Road River Group chert surrounding the trending faults are also important in controlling central stock, particularly to the north and east, where the mineralization. A signifi cant portion of higher grade gold alteration extends more than 1 km outbound. Alteration, mineralization occurs at the intersections of the major associated with strongly weathered gossans, is more east-west-trending breccia zones and west-northwest- intense within the east-west-trending breccia zones, trending fault zones. In contrast, some of the north-south- which contain local areas of advanced argillic alteration and north-northeast-trending fault zones locally control and/or intense silicifi cation. Quartz stockwork and thicker high-grade lead-antimony-silver veins. However, these quartz-fi lled shear zones occur throughout the brecciated sulphide-enriched veins commonly occur along north- (or packages. Local zones of stronger alteration are also north-northwest-) trending faults where they intersect the found along the northwest and north-northeast-trending major east-west-trending breccia zones. Displacement of faults. Strong to moderate hornfelsing also occurs the major east-west-trending zones by barren or weakly adjacent to the stock. mineralized north-trending faults has occurred locally. A broad area of disseminated and fracture-controlled Variably oriented fault zones form a closely spaced sulphide mineralization is coincident with the alteration intersecting network focusing on and adjacent to the area, largely north and east of the central stock. Fine- to central intrusive stock. This ’intersection area‘, marked by medium-grained pyrite with subordinate arsenopyrite,

YUKON EXPLORATION AND GEOLOGY 2002 299 PROPERTY DESCRIPTION commonly altered to scorodite, are disseminated, both weathered and less weathered material. Strongly leached within quartz stockwork and altered sedimentary rocks. rock samples yielded anomalous but generally low gold Local areas of stronger scorodite staining indicate zones values, extending into the 100-200 ppb Au range. In of arsenopyrite enrichment. contrast, less weathered quartz-arsenopyrite (± pyrite) veins and strongly silicifi ed rock, with disseminated pyrite Most sulphide grains within the mineralized area, typifi ed ± arsenopyrite, returned higher gold values, commonly in by well developed gossans, have been completely the range of 300-650 ppb Au, extending up to 800 ppb. leached, leaving a strongly limonitic ’boxwork.’ However, These variations in gold grades, and characteristic local zones of relatively unweathered quartz-arsenopyrite association of gold with high arsenic values, are typical of veining occur throughout the mineralized area. There is a the exposed portion of the east-west-trending breccia remarkable difference in gold values returned by strongly zones in sedimentary rocks outside the intrusive stock.

Table 1. Representative rock sample assay results for various sulphide assemblages1. Sample Au (ppb) Ag (ppm) As (ppm) Bi (ppm) Cu (ppm) Pb (ppm) Sb (ppm) Zn (ppm) Major gold-arsenic (pyrite-arsenopyrite) assemblage M3014 360 4.4 570 62 96 12 8 178 M5004 449 0.7 >10 000 10 70 7 35 18 M5006 185 3.2 405 <2 47 15 32 12 M1003 455 4.0 >10 000 20 84 18 28 22 Copper-arsenic (chalcopyrite-pyrite-arsenopyrite) assemblage M2134 125 41.2 >10 000 264 1.73% <2 82 562 M1060 332 8.2 >10 000 22 744 35 252 15 M2133 40 5.0 18 82 1490 <2 2 542 Zinc-copper (sphalerite-chalcopyrite) assemblage M2046 <5 0.6 932 <2 243 34 50 2180 M2128 25 0.4 16 <2 62 12 8 1035 Lead-silver-arsenic-zinc (galena-arsenopyrite-sphalerite) assemblage M3023 20 113 250 <2 17 1.32% 168 160 M3024 385 652 >10 000 <2 169 10.85% 558 2270 M3025 25 133 1335 12 23 2.23% 100 1580 M3026 150 197 5760 <2884.22%1781020 M3027 75 150 322 <2 42 2.10% 118 462 M1021 135 60.8 566 12 12 1030 212 4 M2104 10 25.4 3620 520 322 1520 102 138 M2075 305 39.6 >10 000 384 627 1770 1195 120 Antimony-lead-arsenic-silver (stibnite-arsenopyrite-galena) assemblage M1000 120 49.0 >10 000 834 191 5070 3420 66 M1016 230 46.6 >10 000 <2 33 3.46% 8530 96 M1019 550 57.2 >10 000 <2 15 6.87% >10 000 228 M1043 1050 560 >10 000 1540 174 4.70% >10 000 488 M1045 70 54.4 4430 82 13 1.96% 8210 54 M1046 320 116 >10 000 132 120 4.73% >10 000 1225 M1048 635 409 >10 000 26 832 3820 2960 1955 1Assays were performed in ALS Chemex labs of North Vancouver, B.C. All rock samples were pulverized until 85% of fragments were less than 75 microns in size; then an evenly mixed 30 g portion was analysed for 34-element aqua regua ICP-AES, as well as gold by fi re assay with atomic absorbtion fi nish. «Overlimits» of Ag, Pb, Sb, Cu were reanalysed to provide respective elemental contents.

300 YUKON EXPLORATION AND GEOLOGY 2002 SOLOVIEV ET AL. – MYSCHKA GOLD PROPERTY, MT. SELOUS AREA

In addition to the major auriferous pyrite-arsenopyrite 300 m by 150 m (50-105 ppb Au; Fig. 4a). The most assemblage, there are several other sulphide-rich mineral eastern anomaly is coincident with a west-northwest- assemblages that, although smaller and more sporadically trending fault zone crosscutting the major east-west- located, contribute to the mineral and geochemical trending breccia packages at a low angle. Several strong zonation of the property. These assemblages are listed in silver-in-soil maxima are also present; the strongest one Table 1. Generally, observed variations in the gold grades (with values from 10 to 65.6 g/t Ag), measuring 300 m by and values of associated metals, as well as mineralogical 250 m, is coincident with silver-bearing galena veining signatures, indicate the existence of several successive southwest of the stock (Fig. 4b). Other elements also sulphide mineral assemblages (stages?) superimposed form strong in-soil-maxima, including Sb (up to within the central property area. Auriferous quartz-pyrite- 786-990 ppm in soils; Fig. 4c), Bi (up to 72 ppm in soils; arsenopyrite stockwork and disseminated mineralization Fig. 4d), Pb (up to 1.24% in soils; Fig. 4e), Cu (up to apparently represents the earliest stage, whereas other 736 ppm in soils) and Zn (up to 3940 ppm in soils, higher sulphide-rich assemblages occurred later, forming a than the highest zinc-in-rock value obtained). These geochemical evolutionary trend from gold-enriched (with metal anomalies have a larger aerial extent than the gold relatively high Au/Ag ratio) associations, toward silver- anomalies. enriched ones. Also quite evident is the presence of at The largest one is the east-west elongate arsenic anomaly least two generations of bismuth minerals, one associated (locally more than 1% arsenic-in-soil values) that covers with chalcopyrite and probably copper sulphosalts, the an area exceeding 1.5 by 2 km (Fig. 4f) and is open to the other associated with galena and lead-antimony east and west. sulphosalts. Two very important features of the soil anomalies must be emphasized. Firstly, the occurrence of Ag, Pb, Sb, Bi and SOIL GEOCHEMISTRY Zn maxima and overall anomalies attributed to the later mineralizing stages are found within the much wider As A total of 417 soil samples have been taken to date on the anomaly attributed to the earlier stage; this suggests Myschka property. The sampling program revealed a ’telescoping‘ of spatial evolution of the mineralization broad area of anomalous values of Au, Ag, As, Pb, Sb, Cu, toward the lateral centre of the system, marked by the Zn and Bi (Fig. 4a-f). This complex anomaly covers the central intrusive stock. This indicates essentially structural, central stock, extends far to the east and west along the rather than thermal, controlling factors caused this breccia and alteration zones, and is essentially open in ‘inverse,’ or ’backward‘ (earlier assemblages throughout, these directions. The anomaly is ’mosaic-textured,’ later assemblages inside) geochemical trend. Interestingly, incorporating a number of local maxima attributed to the a similar geochemical trend apparently occurs on a larger intersections of the major east-west trending zones with scale within the entire Mt. Selous district, where Pb-Zn- faults of other orientations. Very notably, some of these Ag veins are more proximal to the batholith than Au-As maxima occur within overburden overlying portions of mineralization. the central intrusive stock. This supports the idea that major structures extend across (and within) the stock, Secondly, the stronger expression of Ag, Pb, Sb and Zn (later assemblages) mineralization, including soil perhaps hosting higher metal values here than within anomalies, compared to Au mineralization (earlier altered sedimentary rock. This feature, being relatively less assemblage) may indicate that the current erosion level pronounced for gold (with higher gold-in-soil values exposes just ‘the top’ of the system, here dominated by occurring in the breccia packages, mainly outside the later assemblages. As a result, a much stronger expression stock contours), is clearly evident for Ag, As, Bi, Pb and of the earlier gold-enriched assemblages can be expected other elements. at deeper levels. This model would be in agreement with The gold-in-soil anomaly incorporates three well relatively high As/Bi ratios typical of the property and, pronounced maxima. From west to east they measure similar to numerous other Tintina Gold Belt occurrences, 350 m by 200 m (with values from a minimum of 50 ppb indicates a very high (almost uneroded) vertical level of to 260 ppb Au), 400 m by 200 m (50-110 ppb Au), and the exposed mineralized system (Flanigan et al., 2000a).

YUKON EXPLORATION AND GEOLOGY 2002 301 PROPERTY DESCRIPTION

a 664200042000 643000643000 644000644000 645000645000 Figure 4. Soil geochemical 69880006988000 69880006988000 campCAMP contours: (a) gold 0 00 0 20 3 5 1 1130011 99000N000N 0 9 112001 1111500E0E (b) silver 0 1095010 0 06 30 106001 1030010 N (c) antimony

0 6 E 00 (d) bismuth 01 0 1 88800N800N 11016 65 111000 111400E1400E 110650E0 (e) lead LL8800N8800N 99050E050E (f) arsenic. 88600N600N LL8600E8600E 111250E1250E 0 99008E008E 00 0 9 20 + 1 112000 + 111900 + 0 0 00 0 + 69870006987000 0 8 + 10 L8400NL8400N 69870006987000 05 + 0 111000+ 110500 110800 + 111400E1400E 88400N400N + + + 99900E900E + + 00 + 0 8 + 111150E111150E + 0 + 1108000 + + 0 04 + + 8200N8200N 05 + 110400 + 88200N200N 1100500 + + + + + + 9350E9350E + + + + + + + + + + + + + + L8000NL8000N + 0N 0E + E+ 0 0 + + 11350E11350E + 0E0 88000N0 01 + + + 90 + 10100E1 + + 8000N8000N + 9990 + + + 99450E450E + + + + + + + + + + + + 7800N7800N LL7800N7800N + + + + + + 88900E900E + + + 11000E11000E

Soil Geochemical Contours GGoldold ( (Au)Au) 0000 05 LL7600E7600E >50>50 ppbppb 1105 11150E11150E + 226-506-50 ppbppb + 11-2511-25 ppbppb + + 69860006986000 soilsoil samplesample locationlocation + + 69860006986000 55-10-10 p ppbpb + + quartz-dioritequartz-diorite i intrusiventrusive + + + + 0 200200 400400 600600 metresmeters + + + + 642000642000 643000643000 0 10001000 20002000 f feeteet 644000644000 + 645000645000

b 664200042000 664300043000 664400044000 664500045000 66988000988000 66988000988000 campCAMP

0 00 0 20020 3 5 1 113011 99000N000N 0 9 111 111500E1500E 0 1095010 0 06 30 106001 1030010 N

6 0 1 E 0 110160 0 10 88800N800N 65 111000 11400E11400E 110650E0 L8800NL8800N 9050E9050E 88600N600N LL8600E8600E 111250E1250E 99008E008E 0 00 90 0 + 1 1120002 + 111900 + 0 0 0 0 + 66987000987000 0 80 + 10 LL8400N8400N 66987000987000 05 + 0 111000+ 110500 110800 + 111400E1400E 88400N400N + + + 99900E900E + + 00 + 0 8 + 1111150E11150E + 0 + 1080010 + + 0 04 + + 88200N200N 05 + 110400 + 88200N200N 1100500 + + + + + + 9350E9350E + + + + + + + + + + + + + + LL8000N8000N + 0N 0E + E+ 0 0 + + 111350E1350E + 0 88000N0 01 + + + 90 + 10100E1 + + 88000N000N + 99900E + + + 99450E450E + + + + + + + + + + + + 77800N800N LL7800N7800N + + + + + + 88900E900E + + + 111000E1000E

Soil Geochemical Contours SSilverilver ( (Ag)Ag) 0000 05 LL7600E7600E >>1010 p ppmpm 1105 11150E11150E + 55.1-10.0.1-10.0 p ppmpm + 11.1-5.1-5 p ppmpm + + 66986000986000 ssoiloil s sampleample l locationocation + + 66986000986000 00.5-1.0.5-1.0 ppmppm + + + + ++ qquartz-dioriteuartz-diorite i intrusiventrusive 0 + 220000 4 40000 6 60000 M metreserers + + 664200042000 664300043000 + 664500045000 0 11000000 2 2000000 F feeteet 664400044000 +

302 YUKON EXPLORATION AND GEOLOGY 2002 SOLOVIEV ET AL. – MYSCHKA GOLD PROPERTY, MT. SELOUS AREA

642000642000 643000643000 644000644000 645000645000 Figure 4. c continued 69880006988000 66988000988000 campCAMP

0 00 0 20 3 99000N000N 5 1 1130011 0 9 112001 111501500E 0 1095010 0 06 30 106001 1030010 N 6 0 1 E 0 110160 0 10 8800N8800N 65 111000 11400E11400E 110650E0

L8800NL8800N 9050E9050E 8600N8600N 11250E11250E LL8600E8600E 0 00 9008E9008E 90 0 + 1 1120002 + + 111900 0 0 + 00 0 + 00 69870006987000 5 08 1 + L8400NL8400N 66987000987000 110500 + 110800 11100 11400E11400E 88400N400N + + + 99900E900E + + + 00 + 0 8 + 111150E111150E + 0 + 1108000 + + 0 04 + + 8200N8200N 05 + 110400 + 1100500 + + + + + + 88200N200N + + + + + + + + 99350E350E + + + + + + LL8000N8000N + 0N 0E + E+ 0 0 + + 111350E1350E + 0 88000N0 01 + + + 90 + 10100E1 + + 88000N000N + 99900E + + + 99450E450E + + + + + + + + + + + + 77800N800N LL7800N7800N + + + + + + 88900E900E + + + 111000E1000E

AAntimonyntimony ( (Sb)Sb) 0000 05 LL7600E7600E >100>100 ppmppm 1105 11150E11150E + 51-10051-100 ppmppm + 226-506-50 p ppmpm + + 69860006986000 ssoiloil s sampleample l locationocation + + 66986000986000 11-2511-25 ppmppm + + + 2-102-10 ppmppm + + qquartz-dioriteuartz-diorite i intrusiventrusive 0 200200 400400 6 60000 m metresetres + + + + + 642000642000 643000643000 0 10001000 2 2000000 f feeteet 644000 + 645000645000

642000 643000 644000 645000 d 6988000 6988000 camp

0 9000N 112001130 10950 11500E 10600 10300 N

1016 50E 11000 8800N 106 11400E L8800N 9050E 8600N L8600E 11250E 9008E 11900 12000+ + + + + L8400N 6987000 + 10800 11000+ 6987000 10500 + 11400E 8400N + + + 9900E + + + + + + 111150E + + + 10800+ 8200N + 10400 + 8200N 10050 + + + + + + 9350E + + + + + + + + + + + + + + + L8000N + + + + + + 11350E + 8000N10100E + + 8000N + 9900E + + + + + + + 9450E + + + + + + + + + + 7800N L7800N + + + + + + 8900E + + + 11000E

0 Bismuth (Bi) L7600E >50 ppm 1050 11150E + 16-50 ppm + 11-15 ppm + + 6986000 soil sample location + + 6986000 6-10 ppm + + + + + quartz-diorite intrusive + 2-5 ppm + 0 200 400 600 metres + + 642000 644000 + 645000 643000 0 1000 2000 feet +

YUKON EXPLORATION AND GEOLOGY 2002 303 PROPERTY DESCRIPTION

e 664200042000 664300043000 664400044000 664500045000 Figure 4. 69880006988000 66988000988000 continued CcampAMP

0 00 0 20 3 5 1 1130011 99000N000N 0 9 112001 0 1095010 111501500E0E 0 06 30 106001 1030010 N

0 6 E 00 01 0 1 88800N800N 11016 65 111000 111400E1400E 110650E0 L8800NL8800N 9050E9050E 88600N600N 111250E1250E L8600EL8600E 0 99008E008E 00 0 9900 20 1111 112000 + + 0 + 0 0 0 0 + 69870006987000 0 08 + 10 LL8400N8400N 66987000987000 05 + 110800 111000+ 110500 + 111400E1400E 88400N400N + + + 9900E9900E + + 00 + 0 8 + 1111150E11150E + 0 + 1108000 + + 0 04 + + 88200N200N 05 + 110400 + 88200N200N 1100500 + + + + + + 99350E350E + + + + + + + + + + + + + + LL8000N8000N + 0N 0E + E+ 0 0 + + 111350E1350E + 0 88000N0 01 + + + 900E0 + 10100E1 + + 88000N000N + 999 + + + 99450E450E + + + + + + + + + + + + 77800N800N LL7800N7800N + + + + + + 88900E900E + + + 111000E1000E

Soil Geochemical Contours LeadLead (Pb)(Pb) 0000 05 LL7600E7600E 1105 11150E11150E >5000>5000 ppmppm + 1001-5000>1000 ppm ppm + + 251-1000251-1000 ppmppm + 69860006986000 ssoiloil s sampleample l locationocation + + 66986000986000 101-250101-250 p ppmpm + + + + + qquartz-dioriteuartz-diorite i intrusiventrusive 0 + 51-10051-1000 ppmppm + 220000 4 40000 6 60000 m metreseters + + 664200042000 + 664500045000 115-505-50 ppmppm 664300043000 0 11000000 2 2000000 f feeteet 664400044000 +

642000642000 643000643000 644000644000 645000645000 f 69880006988000 69880006988000 CcampAMP

0 00 0 20 3 99000N000N 5 1 1113001 0 9 111200 1111500E500E 0 1109500 0 06 30 110600 1103000 N

0 6 E 00 01 0 1 8800N8800N 11016 65 111000 11400E11400E 10650E10 L8800NL8800N 9050E9050E 8600N8600N 11250E11250E L8600EL8600E 0 9008E9008E 00 0 9 20 1190011 120001 + + 0 + 0 0 0 0 + 0 08 + 10 L8400NL8400N 69870006987000 69870006987000 05 + 108001 110001 + 105001 + 11400E11400E 88400N400N + + + 99900E900E + + 00 + 0 8 + 111150E111150E + 0 + 1080010 + + 0 04 + + 8200N8200N 05 + 104001 + 88200N200N 1005010 + + + + + + 9350E9350E + + + + + + + + + + + + + + L8000NL8000N + 0N 0E + E+ 0 0 + + 11350E11350E + 0E0 88000N0 01 + + + 90 + 110100E+ + 8000N8000N + 9990 + + + 9450E9450E + + + + + + + + + + + + 7800N7800N LL7800N7800N + + + + + + 8900E8900E + + + 11000E11000E

Soil Geochemical Contours AArsenicrsenic ( (As)As) 00 05 L77600E600E >1000>1000 ppmppm 110500 111150E1150E + 501-1000501-1000 ppmppm + 151-500151-500 ppmppm + + 69860006986000 soilsoil samplesample locationlocation + + 69860006986000 51-15051-150 p ppmpm + + + + ++ quartz-dioritequartz-diorite intrusiveintrusive 0 200200 400400 600600 metresmetres + 25-5025-50 ppmppm + + + 642000642000 643000643000 0 10001000 20002000 feetfeet 644000644000 + 645000645000

304 YUKON EXPLORATION AND GEOLOGY 2002 SOLOVIEV ET AL. – MYSCHKA GOLD PROPERTY, MT. SELOUS AREA

CONCLUSIONS ACKNOWLEDGEMENTS The Myschka property represents a newly discovered, We would like to gratefully acknowledge Mr. Ron Berdahl large and very prospective target with potential to host for his submission of the Sophia 1-4 claims to Klad signifi cant bulk-tonnage gold mineralization. This is Enterprises Ltd, leading to acquisition, enlargement and defi ned by the following characteristics: subsequent exploration of the property. We would also like to acknowledge Mr. Jeff Boyce, fi eld technician, for 1. A large cluster of gold, base metal and other his contribution to the project during the 2002 fi eld occurrences in the area of the property situated above season, and Aurora Geosciences Ltd, Ross River the ’hidden‘ portion of the Mt. Selous Batholith of the Expediting, Trans North Helicopters, Fireweed Helicopters, Tombstone Intrusive Suite, and its local control by a A-1 Delivery, the Welcome Inn and all other supply and satellitic intrusive stock or intrusive centre; service industries that supported the project. We would 2. Large widths (up to 200 m) and extent (over 1500 m) of also like to acknowledge Kevin Franck and Associates for breccia with intensive auriferous quartz stockwork and preparation of digital fi gures, and Diane Emond and quartz-fi lled fracture zones; Lara Lewis for editing this paper. 3. Tendency of these auriferous sedimentary rock-hosted breccia zones to dip toward the intrusive stock, REFERENCES assuming that the mineralization within the stock at depth hosts higher gold values; British Columbia and Yukon Chamber of Mines, 2000. The Tintina Gold Belt: Concepts, Exploration and 4. Large dimensions (1200 m by 600 m on surface) of the Discoveries. Cordilleran Roundup, January, 2000, potentially mineralized intrusive stock, similar to those T.L. Tucker and M.T. Smith (session chairs), Special of known large gold deposits (e.g., Fort Knox); Volume 2, 225 p. 5. The occurrence of fault zones of several orientations Burke, M., 2000. Yukon mining and exploration overview controlling mineralization and contributing to the 1999. In: Yukon Exploration and Geology 1999, abundance and grades of metals superimposed on the Exploration and Geological Services Division, Yukon intrusive stock and surrounding metasedimentary rocks Region, Indian and Northern Affairs Canada, p. 2-31. (fault intersection effect); Flanigan, B., Freeman, C., Newberry, R., McCoy, D. and 6. Multi-staged history of formation of auriferous Hart, C., 2000a. Exploration models for mid- and Late- mineralization; Cretaceous intrusion-related gold deposits in Alaska 7. Presence of a large (over 1.5 km by 2 km) multi- and Yukon Territory, Canada. In: Geology and Ore element geochemical anomaly coincident with the Deposits 2000: The Great Basin and Beyond: intrusive stock and adjacent portion of the Geological Society of Nevada Symposium Proceedings, metasedimentary rocks; May 15-18, 2000. J.K. Cluer, J.G. Price, E.M. Struhsacker, R.F. Hardyman and C.L. Morris, (eds.), p. 591-614. 8. Favourable geochemical signatures suggesting minimal erosional levels of the mineralized system. Flanigan, B., Freeman, C., McCoy, D., Newberry, R. and Hart, C., 2000b. Paleo-reconstruction of the Tintina During the 2002 fi eld season, the property was advanced Gold Belt — Implications for mineral exploration. In: The to a drill-ready stage. A diamond-drill program proposed Tintina Gold Belt: Concepts, Exploration, and for 2003 is designed to test the subsurface continuation Discoveries, Special Volume 2, BC and Yukon Chamber of major auriferous breccia zones into the intrusive stock. of Mines, Cordilleran Roundup, January, 2000, p. 35-48. Friske, P.W.B., Hornbrook, E.H.W., Lynch, J.J., McCurdy, M.W., Gross, H., Galletta, A.C. and Durham, C.C., 1990a. Regional stream sediment and water geochemical data, central Yukon (NTS 105 K east). Geological Survey of Canada, Ottawa, Ontario, Canada, GSC Open File 2174, 98 p., 47 maps at 1:535 714 scale and 2 maps at 1:250 000 scale.

YUKON EXPLORATION AND GEOLOGY 2002 305 PROPERTY DESCRIPTION

Friske, P.W.B., Hornbrook, E.H.W., Lynch, J.J., Mortensen, J.K., Murphy, D.C., Poulson, K.H. and McCurdy, M.W., Gross, H., Galletta, A.C. and Bremmer, T.J., 1996. Intrusion related gold and base Durham, C.C., 1990b. Regional stream sediment and metal mineralization associated with the Early water geochemical reconnaissance data, east- central Cretaceous Tombstone Plutonic Suite, Yukon and east- Yukon (NTS 105 N). Geological Survey of Canada, central Alaska. In: New Mineral Deposit Models of the Ottawa, Ontario, Canada, GSC Open File 2363, 116 p., Cordillera, Short Course Notes, British Columbia 43 maps at 1:535 714 scale and 2 maps at Geological Survey and Northwest Mining Association, 1:250 000 scale. p. G1-G11. Gordey, S.P. and Anderson, R.G., 1993. Evolution of the Yukon MINFILE 2001. Tay River - 105K. Exploration and Northern Cordilleran Miogeocline, Nahanni Map Area Geological Services Division, Yukon Region, Indian and (105I), Yukon and Northwest Territories. Geological Northern Affairs Canada. Survey of Canada, Memoir 428.

306 YUKON EXPLORATION AND GEOLOGY 2002